u/track-impulse

Quick update for anyone running Track Impulse with iRacing.

The kerb effect now has its own dedicated card with independent volume and routing controls. Previously it was folded into the Fast Suspension card, which meant you couldn't control kerb feel separately from the other suspension. If you wanted more kerb and less suspension, or vice versa, you were stuck adjusting one slider that affected both.

Kerb effect doesn't have frequency control as it's mapped directly to the Rumble Pitch iRacing sends out for its kerb effect telemetry which means it's a one to one mapping of the output frequency coming from iRacing. As it's an axillary effect on top of the other two for suspension I decided to leave it as is for now.

Why was it combined in the first place? iRacing is the only sim that provides a native rumble pitch signal for kerbs, so it always had its own detection path internally, but I didn't have time to add a separate GUI card for it when I added the dual-band suspension system in last week. It was an interim solution that stuck around longer than it should have.

Other stuff in this update: A device wizard rework with a bunch of audio device fixes for Realtek multi-endpoint setups and other devices that we not getting detected that were causing issues for people running multiple bass shakers or multiple devices.

Also added a feature to the zone setup which allows custom zones to map car corner effects how you see fit, for example you might have two additional shakers for front and back under your seat and you want to map the front or rear of the car to them in addition to your 4 corner shakers, now you can in this new release.

I've been working on a haptic engine for sim racing called Track Impulse and wanted to see what the latency actually looks like in slow motion. So I stuck my phone on 240fps with my screen and bass shaker both in frame.

The video shows two back-to-back gear change tests, slowed to 0.1x with a frame counter burned in.

First clip: gear changes on screen, shaker moves 2 frames later, roughly 8ms delay.

Second clip: gear changes on screen, then it takes 33 frames for it to fire so about 137ms before it moves.

I knew there was a difference because it's night and day in the seat feeling it, but seeing it frame by frame is pretty eye opening honestly.

In these videos I'm using the same sound card for both tests on the same PC.

For context, I profiled the internal pipeline and the haptic processing from telemetry read to audio buffer write takes about 40 microseconds. The rest of the latency is just the audio buffer, which at typical ASIO settings is around 1ms. The 8ms you see in the video is basically TI waiting on iRacing to submit the telemetry.

Track Impulse is free during beta, supports iRacing, ACC, AC, AC Evo, AC Rally and LMU if anyone wants to try it.

Hey everyone, Dennis here. I'm the sole dev of Track Impulse, a bass shaker & haptics engine I've been building from scratch.

For anyone who hasn't seen it before: the short version is that standard haptic software routes audio through the Windows audio stack, adding 100ms+ of latency. At 200 km/h that's 5.5 metres past the kerb before you feel anything. Track Impulse writes directly to your sound card via ASIO or WDM-KS bypassing buffers other software uses, hitting 2-9ms with ASIO or 5-19ms end to end latency with iRacing on any standard sound card.

Just shipped a big update and wanted to share what's new.

Rebuilt from scratch

The entire interface has been redesigned with a new Direct2D renderer. You can pick from 6 accent colours (TI Rosso, Estoril Blue, British Racing Green, Ruf Yellow, Championship White) and 3 density sizes depending on your screen setup.

5 sims supported

iRacing, ACC, AC, Le Mans Ultimate, and Assetto Corsa Evo are all working with all 7 effects: road vibration, suspension impact, kerb rumble, engine, ABS, gear change, and wheel slip. Each sim has its own tuned defaults and per-sim profiles.

iRacing-specific tuning

Track Impulse runs a dedicated telemetry reader and haptic engine for each sim, so every effect can be tuned specifically for how that sim delivers its data. For iRacing, kerbs feel different depending on the surface you're hitting. Suspension picks up bumps and impacts without buzzing on smooth tarmac. Wheel slip lets you feel when the car starts sliding, whether it's understeer pushing wide or the rear stepping out, and there's a simple sensitivity slider if you want to dial it in per car. All effects respond in real time with no perceptible delay.

Free during beta: https://track-impulse.com

Happy to answer questions or take feedback. You can also reach me at support@track-impulse.com

Hey everyone, Dennis here from Track Impulse. TI is a free haptic engine for bass shakers that reads sim telemetry directly and outputs via ASIO, so you feel kerbs, bumps, ABS and engine rumble within a few milliseconds of it happening in the sim instead of the 100ms+ delay you get from standard haptic software.

Just shipped v0.6.004 with a bunch of LMU-specific fixes that I wanted to bring up for this community.

LMU fixes in this update:

ABS completely reworked. ABS output was way too weak before, coming through at a fraction of what the slider was set to. That's fixed. On top of that, different car classes now feel different.

Engine rumble frequency fixed. The frequency sweep from idle to redline wasn't tracking correctly. Now it responds properly across the full RPM range.

Calibration improved. Hard braking could throw off the baseline calibration, causing effects to feel off afterwards. That's sorted.

Vehicle name detection. TI now reads which car you're driving. This is groundwork for per-car tuning down the road.

General improvements (all sims):

• Per-effect-per-zone volume control in Channel Routing. Instead of just on/off checkboxes you now get fine sliders so you can dial in exactly how much of each effect goes to each shaker zone
• Global hotkey (Alt+Shift+T, configurable) to show/hide TI from any app
• VR auto-minimize: detects SteamVR and minimises TI after 10 seconds
• Return to Sim button for quick minimise
• Profile stepper arrows to cycle through saved profiles without opening dialogs
• Refreshed UI with cleaner card design (step 1 of 3, more changes coming soon )

Track Impulse is free during beta. Works with any ASIO-compatible or standard audio interface.

Download and full changelog at https://track-impulse.com

Happy to answer any questions.